Hi,

I compiled with no error a C program, than I tryed to execute it and than I get this error:

connessione al server fallita: Address family not supported by protocol family


What does it mean?

Why I get this error only on Mac os x while on Ubuntu the program works?

The code is:
/*
* EsameClient.c
*
*/

#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define NR 3
#define MAXLENGTH 80
#define SERVER_PORT 1313

int main (unsigned argc, char **argv)
{
int sockfd;
struct sockaddr_in server={AF_INET,htons(SERVER_PORT),INADDR_ANY};
int i=0,len;
char buf[MAXLENGTH],c;
int buffer[NR], stato;

/* Controllo Parametri Passati da Terminale */
if(argc != 4) // argv[1] -> argv[3] sono le risorse
{
perror("Chiamata corretta del programma:\nnome-programma <risorsa1> <risorsa2> <risorsa3> \n<risorsai> deve essere un intero positivo");
exit(1);
}

/* impostazione del transport end point */
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("chiamata alla system call socket fallita");
exit(1);
}
/* connessione al server */
if(connect(sockfd,(struct sockaddr *)&server,sizeof server)==-1)
{
perror("connessione al server fallita");
exit(2);
}


/* ricezione e stampa a video del messaggio di benvenuto del server */
if(recv(sockfd,buf,27,0)>0)
{
buf[27]='\0';
printf("%s",buf);
}
else
{
perror("Connessione al server interrotta");
exit(3);
}

/* acquisizione della stringa da standard input */
/* while((c=getchar())!='\n' && i<MAXLENGTH)
buf[i++]=c;
buf[i]='\0';
len=strlen(buf); */

// Imposta buffer e len
for(i=0; i<NR;i++)
buffer[i]=argv[i+1];
len=sizeof(buffer); // size?? o # = 3/////////////////////////////////////////////////////


/* invio e ricezione della stringa */
if(send(sockfd,buffer,len,0)==-1) // Se send ritorna -1 = errore
{
perror("Errore nell'invio della richiesta risorse al server");
exit(4);
}
if(recv(sockfd,&stato,len,0)>0)
{
printf("%d\n",stato);
}
else
{
perror("Connessione al server interrotta");
exit(3);
}

/* chiusura della connessione */
close(sockfd);
}

No one can give me an advice?

Google suggests Ettercap :: View topic - ettercap & MacOS X (10.2.6) not finding other machines..

One of the problems with your code is that you are using IP address INADDR_ANY. This allows your program to work without knowing the IP address of the system it is running on, or, in the case of a system with multiple network interfaces, it allows your server to receive packets destined to any of the interfaces. However there are issues with using INADDR_ANY. Do a Google search on INADDR_ANY for more information.

I suggest that you bind to a specific server address.